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What is the number of d electrons in Cr^...

What is the number of `d` electrons in `Cr^(3+)` ions?

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The correct Answer is:
`3`
`Cr^(+3)=1s^(2)2s^(2)2P^(6)3s^(2)3p^(6)4s^(0)3d^(3)`
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